Does it do it with the spare key?
My guess is some pins in the barrel could be sticky and need some lube (graphite or silicone lubricant). It wouldn't be the transmitter in the key as the key still turns, just the immobiliser is still armed when turned and the car won't power up or start.
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2005 LS Focus LX
Nov05 | Manual | Black Sapphire
250,000kms.
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